Puppet users - Sep 2014 - puppetlabs-apache n00b question - docroot value for fully proxied virtual host?

Hi there,
pretty new to puppet so I'm guessing this is something simple. I'm
trying
to set up an apache virtual host that simply acts as a proxy to push all 
traffic on port 80 to a servlet running on 8080. I have this working on a 
non puppet managed server with this virtual host:

<VirtualHost *:80>
  ServerAdmin webmaster@localhost
  ServerName ci.company.com
  ServerAlias ci
  ProxyRequests Off
  <Proxy *>
    Order deny,allow
    Allow from all
  </Proxy>
  ProxyPreserveHost on
  ProxyPass / http://localhost:8080/
</VirtualHost> 

The best I've managed so far using puppet is with this:

apache::vhost { 'ci.spex.com':
  port    => '80',
  proxy_pass => { 'path' => '/', 'url' =>
'http://localhost:8080/'},
  docroot => '/some/path',
  default_vhost => true,
}

This works, but I'm curious what value I should set for docroot? As all 
traffic is proxied, I (believe) the value is irrelevant. Is there a way to 
tell the puppet module to not write out a docroot?

Cheers!

Paul

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